The contents of the accumulator are ANDed, bit by bit, with the contents of the addressed core storage location. The result replaces the contents of the accumulator. ANDing occurs only between corresponding bit positions in the accumulator and the core-storage word: bit 0 is ANDed only with bit 0, bit 1 only with bit 1, and so on. The four possible ANDing results are:
|From Core Storage Word||From Accumulator||Result in Accumulator|
Contents of the addressed core-storage word are not changed as a result of the operation. An example of ANDing is:
0101 0000 1111 1010 Word in accumulator AND 1010 1111 1010 1111 Word from core storage 0000 0000 1010 1010 Result in accumulator
There are no addressing exceptions for the logical AND instruction; all forms of addressing that are described under "Effective-Address Generation" apply to the AND instruction.
Indicators: The carry and overflow indicators are not affected during the AND operation.
Programming Note: The AND instruction is particularly useful in two applications.
XXXX XXXX XXXX XXXX Word in accumulator AND 1111 1101 1111 1111 Mask in storage XXXX XXOX XXXX XXXX Result in accumulator
XXXX XXXX XXXX XXXX Word in accumulator AND 0001 0000 0000 0000 Mask in storage O00X 0000 0000 0000 Result in accumulator
|Assembler Language Coding||Hexadecimal Value||Description of Instruction|
|AND||DISP||E0XX||AND contents of CSL at EA (I+DISP) with A|
|AND||1||DISP||E1XX||AND contents of CSL at EA (XR1+DISP) with A|
|AND||2||DISP||E2XX||AND contents of CSL at EA (XR2+DISP) with A|
|AND||3||DISP||E3XX||AND contents of CSL at EA (XR3+DISP) with A|
|AND||L||ADDR||E400XXXX||AND contents of CSL at EA (Addr) with A|
|AND||L||1||ADDR||E500XXXX||AND contents of CSL at EA (Addr+XR1) with A|
|AND||L||2||ADDR||E600XXXX||AND contents of CSL at EA (Addr+XR2) with A|
|AND||L||3||ADDR||E700XXXX||AND contents of CSL at EA (Addr+XR3) with A|
|AND||I||ADDR||E480XXXX||AND contents of CSL at EA (V in CSL at Addr) with A|
|AND||I||1||ADDR||E580XXXX||AND contents of CSL at EA (V in CSL at "Addr+XR1") with A|
|AND||I||2||ADDR||E680XXXX||AND contents of CSL at EA (V in CSL at "Addr+XR2") with A|
|AND||I||3||ADDR||E780XXXX||AND contents of CSL at EA (V in CSL at "Addr+XR3") with A|
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